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on the web CSS Code used to describe document style JavaScript General-purpose scripting language HTTP Protocol for transmitting web resources Web APIs Interfaces for building web applications Web Extensions Developing extensions for web browsers Web Technology Web technology reference for developers Guides Guides Overview / MDN Learning Area Learn web development MDN Learning Area Learn web development HTML Learn to structure web content with HTML CSS Learn to style content using CSS JavaScript Learn to run scripts in the browser Accessibility Learn to make the web accessible to all Plus Plus Overview A customized MDN experience AI Help (beta) Get real-time assistance and support Updates All browser compatibility updates at a glance Documentation Learn how to use MDN Plus FAQ Frequently asked questions about MDN Plus Curriculum New Blog Play AI Help Beta Search MDNinput Search Theme Log in Sign up for free Resources for Developers , by Developers Documenting web technologies, including CSS, HTML, and JavaScript, since 2005. Search MDNinput Search Mandala / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + { { { { } } } } { { { { } } } } { { { { } } } } { { { { } } } } { { { { } } } } { { { { } } } } ../../ ../../ ../../ ../../ ../../ ../../ ../..///////////////// Featured articles Blog Developer essentials: JavaScript console methods The JavaScript console is an essential tool for web development. Learn new and fun ways to use the console to display data and debug your code. Blog Introduction to web sustainability What can web designers and developers do to build a more sustainable web? This post explores the environmental impacts of web technologies and looks at some of the ways we can build greener websites. Web APIs CSS Custom Highlight API The CSS Custom Highlight API provides a mechanism for styling arbitrary text ranges on a document by using JavaScript to create the ranges, and CSS to style them. CSS color The color CSS data type represents a color. A color may also include an alpha-channel transparency value, indicating how the color should composite with its background. Latest news Lift-off: The MDN Curriculum launch developer.mozilla.org 3 months ago Baseline’s evolution on MDN developer.mozilla.org 5 months ago Introducing the MDN Playground: Bring your code to life! developer.mozilla.org a year ago Recent contributions Add width requirements and `clip` computation for the `overflow` property mdn/content an hour ago Ff126 RelNote: Selection.getComposedRanges() and friends mdn/content an hour ago `FileReader.readyState`: combine value table and list mdn/content an hour ago zh-cn: create the translation of "Mozilla CSS extensions" mdn/translated-content an hour ago added release note for css zoom in ff126 mdn/content 2 hours ago Add cumulative layout shift and link aspect-ratio to multimedia perf page mdn/content 6 hours ago [es] replace `amazing.site` with `example.com` in `Web/HTTP/CORS/Errors/CORSMissingAllowOrigin` example mdn/translated-content 7 hours ago [es] replace broken link to `affirmationsforpositivethinking.com` mdn/translated-content 7 hours ago zh-cn: lint glossary mdn/translated-content 8 hours ago [es] remove obsolete `Glossary/Simple_header` from example mdn/translated-content 8 hours ago Contributor Spotlight Yuji has the most up-to-date and accurate information and the content is presented in an easy-to-understand manner. I also like that it’s available in many languages (very important!). Get involved → Mandala / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + { { { { } } } } { { { { } } } } { { { { } } } } { { { { } } } } { { { { } } } } { { { { } } } } ../../ ../../ ../../ ../../ ../../ ../../ ../..///////////////// MDN logo Your blueprint for a better internet. MDN on Mastodon MDN on X (formerly Twitter) MDN on GitHub MDN Blog RSS Feed MDN About Blog Careers Advertise with us Support Product help Report an issue Our communities MDN Community MDN Forum MDN Chat Developers Web Technologies Learn Web Development MDN Plus Hacks Blog Mozilla logo Website Privacy Notice Cookies Legal Community Participation Guidelines Visit Mozilla Corporation’s not-for-profit parent, the Mozilla Foundation . Portions of this content are ©1998– 2024 by individual mozilla.org contributors. Content available under a Creative Commons license...